... integrity experiment upstream oil & gas international journal symmetry axis undrained experiment wellbore design shale perpendicularly overburden shale geomechanics symposium outcrop shale skempton literature reservoir characterization friction orientation loading norway ARMA 22...

... is particularly challenging. In this work, we present the measurements of the Biot’s effective coefficient α and the Skempton’s B . The measurements on α are made by using strain gauges by following two different approaches: (1) α = 1 − K/Ks, K is the drained bulk modulus and Ks the grain bulk modulus...

... ABSTRACT: Skempton's parameters B S and A S describe the undrained pore pressure response to stress state changes in porous media. In our study we examined the relationship between two poroelastic coefficients, (equation) and A , equivalent to Skempton's parameters within given elastic...

... increase in the reservoir during injection of CO 2 into the subsurface will also influence surrounding rocks and the undrained pore pressure response of low-permeable caprocks overlying such reservoirs can be estimated from Skempton's pore pressure parameters. We present results from a laboratory study...

... experimentally investigated under hydrostatic and deviatoric compression at drained, undrained and unjacketed conditions. Tests were conducted up to a confinement state of 60 MPa (8700 psi). The results revealed that drained and undrained bulk moduli, Young's modulus, Biot and Skempton coefficients are highly...

... in these tests seem to play a key role in deciding to what extent shale fails in a ductile manner, leading to sealing shale barriers, or in a more brittle manner, where possibly formed barriers are not sealing. In the analysis, Skempton parameters have been determined at different stages in the tests...

... ABSTRACT: In anisotropic materials Skempton's B parameter becomes a second order tensor. It is well established from laboratory experiments that the Skempton B tensor may deviate significantly from isotropy, which will influence the pore pressure response. The anisotropy of B in essence...

... ABSTRACT: Fluid production from or injection into a subsurface reservoir leads to stress pressure changes inside and outside the reservoir. The overburden often consists of low permeability shale, and the undrained pore pressure response may be estimated from Skempton’s empirical equations...

... that does not happen under the assumption of isotropy. Experimental techniques have been aimed at making reliable measurements of Skempton's coefficients taking into account the effect of the dead volume of the drainage system. Special attention has been dedicated to full saturation with the use of the back...

...., Skempton’s pore pressure parameter B) and the tendency of the clay shale to dilate depend strongly on the confining stress. The stress path utilized in standard triaxial tests may substantially differ from the stress path associated with drilling or tunneling, and its influence on the effective strength...

... to dissolve them in water. A process to saturate Berea sandstone is presented. Skempton’s B coefficient was measured at each increment of back pressure while keeping the effective mean stress approximately the same. A B -value that was constant and independent of the magnitude of the back pressure...

... excavation stiff clay stress-strain curve progressive failure landslide stability shear strength Skempton London Clay clay shale first-time slide overconsolidated stiff clay Rock Mechanics In the National Interest, Elsworth, Tinuccl & Heasley (eds), © 2001 Swets & Zeltlinger Usse, ISBN 90 2651...

...Rock Mechanics for Indust Amadei, Kranz, Scott & Smea!lie (eds) ¸ 1999 Balkema, Rotterdam, ISBN 90 5809 052 3 Pore pressure and confining stress dependence ofporoelastic linear compressibilities and Skempton's B coefficient for Berea sandstone D.J. Hart & H. EWang University of Wisconsin-Madison...

... ABSTRACT INTRODUCTION Biot's equations for wave propagation in poroelastic media [1-5] describe elastic and transport properties of fluid-saturated porous rocks. Skempton's pore pressure buildup coefficient [6] appears in the constitutive equations of Biot theory [7-10]. Thus this parameter...

... found in stiff clays, studied by Skempton (1966). He conducted direct shear tests and triaxial teats on samples of remoulded clays, and found that the samples responded to shear by the development of reidel shears orientated at 10 to 30 degrees to the pdneiple displacement direction. Movement along...